Tightening tool



FIG. 1 is a front, top, and right side perspective view of a tighteningtool showing our new design;

FIG. 2 is a rear, top, and right side perspective view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The portions of the tightening tool in broken lines are shown forillustrative purposes only and form no part of the claimed design.

CLAIM The ornamental design for a tightening tool, as shown anddescribed.